When installing HDF only, there used to be a default Grafana dashboard for NiFi with the general metrics of NiFi available. When installing HDF on top of an existing HDP cluster (with latest versions of stacks), there is no default dashboard for NiFi even though there are some for Storm and Kafka. This should be fixed for the next version.
Problem Summary: Nifi dashboard not visible in Grafana after installing HDF over HDP.
Root cause: json file is missing in the grafana directory
2 Options 1. Import Json files using grafana dashboard (HDP) or 2. Copy json file as below